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Summary: The "Plot Pole-Zero" subVI accepts filter coefficients either in direct form -- a (reverse) and b (forward) coefficients -- or in cascade form produced by the LabVIEW filter coefficient calculator subVIs and creates the z-plane pole-zero plot.
This subVI is based on the original "zplane.vi" pole-zero diagram plotter developed by Mark Yoder for the DSP First LabVIEW library.
Details: See the video for a complete demonstration:
Example code from the Example Code Exchange in the NI Community is licensed with the MIT license.
